Missle Command Died Today

gregr

Member
Joined
Jan 24, 2010
Messages
236
Reaction score
2
Location
balitmore, Maryland
Turn on Missle Command today and all I get is a blue screen. Tested the voltage points and I'm not getting +5v to the PCB or to the control panel, the +12v and -5v test just fine. Can someone help me get started with trouble shooting this.

Thanks
Greg
 
I don't own a missile command so take this for what it's worth . I'm pretty sure missile command uses an AR board to supply the +5v you are missing. i would test there to see if it's present. If not you probably want to rebuild that board. Technically it may be possible the issue lies in the power brick but I think it's more likely the issue is on the AR board. The 5v regulator may have died or some other component like a resistor may have burned up. Of course if you have burned components you may have other issues to look for else where.
 
Have you checked your fuses? (not just visually; pull out and check for continuity with a meter)
 
the +5v regulator on the ar2 is the tranistor 2n3055 situated on the ar2's heatsink/radiator,if you check the fuses and are not losing anything there and then check +5v at the ar2,if you have none there,change that transistor,its the +5v regulator.
:)
 
Before you start swapping components out of the AR board you might first check that the AR board is receiving the 10.3VDC it needs to produce the +5VDC. There's a handy test point on the AR board for this. If the 10.3VDC is missing check the power brick. Obvious culprits would be the big blue, or one of the two diodes that sit on the rectifier board.
 
Missle Command Fixed - with a follow-up question

Sure enough it was Fuse #5, didn't look blown but not continuity upon testing. My follow-up question - the schmatics call for an 8A at 125v, I had a 8A at 250v handy, replaced and getting +5 to the board and everything is working, however will the difference in voltage of the fuses casuse any other problems or am I ok.

Thanks for all the help
Greg
 
Glad you got it working. Now never trust your eyes to test a fuse again ;)

No problems, a 250V fuse is perfectly fine; the current (amperage) rating is the "functional" value (and what should properly match the manual/label). Substituting a higher voltage rating for a fuse is always OK.
 
Back
Top Bottom